There may be new technology for IVF (In Vitro Fertilization, where a woman can be artificially inseminated to get pregnant when there are difficulties for whatever reason in achieving pregnancy)  that may reduce the odds of a woman being impregnated with multiple embryos, as is often the case now in a lot of IVF endeavors, with women having mutliple babies from it.   In fact, most women understand this fact and have to be ok with it to be able to go through the process. 

IVF is sort of a “test tube baby” sort of process.  What happens is that eggs are taken from a woman, and the sperm is taken from the man, and  those are cultivated in a petrie dish (or however else they do this, there may be some other mechanism used for all I know).  Currently, the doctor takes the most viable of the bunch and implants them into a woman’s uterus, and the hope is that one of some of them take off and start to develop into little bundles of joy. 

The newer process, and researchers are hoping a soon to be very viable and cost effective process, is that the doctors would take the most viable cells via DNA tests to determine which are the strongest and most able to develop into these blastocysts, which are the precursor to a full blown fetus, and therefore cut down on the need to cultivate multiples of babies since this is essentially what leads to multiple births - the needs to implant multiples for maximum likelihood that one or some will take and the women will be pregnant. 

Newer DNA testing and application techniques are going to make for some very exciting advances in modern day science. Already, there are several DNA tests on the horizon or at least in research and development, that may help determine serious illness before it occurs by determining likelihood of development via DNA structure and background. 

These genetic weaknesses may be able to be exploited to help find cures and tests to prevent degenerative diseases such as cancers and other things that can be prevented if caught early or put into preventive mode before they are even a problem.